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// 
//  The MIT License (MIT)
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//  of this software and associated documentation files (the "Software"), to deal
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//  ---------------------------------------------------------------------------------

using System;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Threading.Tasks;
using Windows.Graphics.Imaging;
using Windows.Storage;
using Windows.UI.Xaml.Media.Imaging;

namespace PhotoSharingApp.Universal.Extensions
{
    /// <summary>
    /// Provides extension methods for the <see cref="WriteableBitmap" /> class.
    /// </summary>
    public static class WriteableBitmapExtensions
    {
        /// <summary>
        /// Saves the given <see cref="WriteableBitmap" /> to a specified storage file.
        /// </summary>
        /// <param name="writeableBitmap">The writeable bitmap.</param>
        /// <param name="storageFile">The storage file.</param>
        public static async Task SaveToStorageFile(this WriteableBitmap writeableBitmap, IStorageFile storageFile)
        {
            using (var writestream = await storageFile.OpenAsync(FileAccessMode.ReadWrite))
            {
                var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, writestream);

                using (var pixelStream = writeableBitmap.PixelBuffer.AsStream())
                {
                    var pixels = new byte[pixelStream.Length];
                    await pixelStream.ReadAsync(pixels, 0, pixels.Length);

                    encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore,
                        (uint)writeableBitmap.PixelWidth, (uint)writeableBitmap.PixelHeight, 96.0, 96.0, pixels);

                    await encoder.FlushAsync();
                }
            }
        }
    }
}